Example usage for org.springframework.data.mongodb.core.mapreduce MapReduceResults MapReduceResults

Introduction

In this page you can find the example usage for org.springframework.data.mongodb.core.mapreduce MapReduceResults MapReduceResults.

Prototype

public MapReduceResults(List<T> mappedResults, MapReduceOutput mapReduceOutput) 

Source Link

Document

Creates a new MapReduceResults from the given mapped results and the MapReduceOutput .

Usage

From source file:org.springframework.data.mongodb.core.MongoTemplate.java

public <T> MapReduceResults<T> mapReduce(Query query, String inputCollectionName, String mapFunction,
        String reduceFunction, MapReduceOptions mapReduceOptions, Class<T> entityClass) {
    String mapFunc = replaceWithResourceIfNecessary(mapFunction);
    String reduceFunc = replaceWithResourceIfNecessary(reduceFunction);
    DBCollection inputCollection = getCollection(inputCollectionName);
    MapReduceCommand command = new MapReduceCommand(inputCollection, mapFunc, reduceFunc,
            mapReduceOptions.getOutputCollection(), mapReduceOptions.getOutputType(), null);

    DBObject commandObject = copyQuery(query, copyMapReduceOptions(mapReduceOptions, command));

    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug("Executing MapReduce on collection [" + command.getInput() + "], mapFunction [" + mapFunc
                + "], reduceFunction [" + reduceFunc + "]");
    }/*  w  w  w  . j  a  v  a 2 s . co m*/

    CommandResult commandResult = command.getOutputType() == MapReduceCommand.OutputType.INLINE
            ? executeCommand(commandObject, getDb().getOptions())
            : executeCommand(commandObject);
    handleCommandError(commandResult, commandObject);

    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug(String.format("MapReduce command result = [%s]", serializeToJsonSafely(commandObject)));
    }

    MapReduceOutput mapReduceOutput = new MapReduceOutput(inputCollection, commandObject, commandResult);
    List<T> mappedResults = new ArrayList<T>();
    DbObjectCallback<T> callback = new ReadDbObjectCallback<T>(mongoConverter, entityClass);
    for (DBObject dbObject : mapReduceOutput.results()) {
        mappedResults.add(callback.doWith(dbObject));
    }

    MapReduceResults<T> mapReduceResult = new MapReduceResults<T>(mappedResults, commandResult);
    return mapReduceResult;
}

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